Question

27.4 упростите выражение​

Answer 1

ответ:√3/3

4) -2sin55° sin-30°/2sin55° cos-30°

-sin55°sin-30°/sin55°cos-30°

-sin-30°/cos-30°

-(-1/2)/cos-30°

-(-1/2)/√3/2

1/2/√3/2

1/√3

√3/3